Sofa



FIG. 1 is a front elevational view of the sofa comprising my new design;

FIG. 2 is a right side elevational view thereof, the opposite side elevational view being a mirror image thereof; and,

FIG. 3 is a top plan view thereof.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sofa, as shown and described. 